The families of 819 Troop get the chance to visit the recruits at the Lympstone Commando Training Centre and speak frankly about their impressions of the tough course : which this week involves practising escape techniques from a submerged helicopter. Hundreds of miles away in the Omani desert, 40 Commando's chaplain provides an insight into his responsibilities toward the troops.
As graduation day approaches, the recruits of 819 Troop face their final test : a 30-mile run across Dartmoor which they must complete in eight hours while carrying full kit. Meanwhile, Taunton-based 40 Commando embark on a mountain navigation exercise in Scotland, and snipers reveal the tricks of their deadly trade.